Security
Add touch support
Implementation of long file name support in mkdir/touch
No need to register a cluster for an empty file
Fix sequence size and null terminate long file name
FAT32 says that if .. points to root, cluster number must be 0
Fix the order of LFN entries
Improve a bit ls
Complete mkdir and touch support
Add support for date and time in ls
Move RTC support in its own file
Finish support for dates
Implement removal of file